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Electrical transport in some poly metallo phthalocyanines
G. Rangarajan, Periyakaruppan Thangiah Manoharan
Published in SPIE
1992
Volume: 1523
   
Pages: 469 - 472
Abstract
Complex ac impedance measurements on Poly metallo phthalocyanines before heat treatment (I[MPc] (M=Cu,Ni)) have been performed and the data analysed using the Havriliak-Negami dispersion relation for polymers. The parameters so obtained are reported. Heat treated polymers (II[MPc]n (M=Cu,Ni)) show an increase in dc electrical conductivity, ω, by several orders of magnitude. The temperature dependence of ω is in accordance with that expected for variable range hopping of carriers in 3-dimensions(VRH 3D) for II[CuPc]n and that expected for VRH of carriers in 2D(VRH 2D) for II[NiFc]n. The measurement of ω for II[CuPc]n was extended down to 4.2K. The significant deviation from linearity of the log(o√T) vs T-14/4 plot at low temperatures can be accounted for by the model proposed by Sheng which is based on electron transfer across insulating gaps in conducting pathways by fluctuation induced tunneling. Hall mobility measurements of II[CuPc]nshow that the carriers are holes and the Hall constant was found to be 6×l0-4 Ωm/T at RT. © 1992 SPIE. All rights reserved.
About the journal
JournalData powered by TypesetProceedings of SPIE - The International Society for Optical Engineering
PublisherData powered by TypesetSPIE
ISSN0277786X
Open AccessNo
Concepts (13)
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    Electric impedance
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    Hall mobility
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    Integrated circuits
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    Temperature distribution
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    AC IMPEDANCE MEASUREMENT
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    Dc electrical conductivity
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    DISPERSION RELATIONS
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    Electrical transport
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    HALL MOBILITY MEASUREMENT
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    Orders of magnitude
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    Temperature dependence
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    Variable range hopping
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    Polymers